JP2011082070A - Optical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical device which has superior gas barrier properties, dimensional stability, and strength despite its flexibility and which can be manufactured at low cost. <P>SOLUTION: The optical device includes a first lamination, having a flexible first glass board and a first reinforcing layer made of a resin material and formed on the first glass board; a second lamination having a flexible second glass board and a second reinforcing layer made of a resin material and formed on the second glass board; and an optical element placed pinched between the first lamination and the second lamination. The thermal expansion coefficient of the first reinforcing layer is substantially the same as that of the second reinforcing layer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a flexible optical device.

  Current flat panel displays are widely used not only for TVs and desktop monitors, but also for portable electronic devices such as portable notebook computers, mobile phones, portable pagers, and portable game machines. Further weight reduction, size reduction, and thickness reduction are required. On the other hand, in response to the full-scale spread of digital terrestrial broadcasting, which is planned to be implemented in recent years, and the further evolution of the ubiquitous network in the future, the spread of mobile displays is definitely predicted. Therefore, there is a demand for practical use of a flexible display that is thinner and lighter than current flat panel displays.

  Here, the flexible display not only has the advantage of being thinner and lighter than the conventional flat panel display, but also can be freely deformed. ) A mobile display can be realized, and there is an advantage that a display suitable for mobile can be obtained. In addition, since the flexible display can be manufactured by a continuous process using a long film, an advantage of excellent mass productivity is also expected.

By the way, as a member constituting a flat panel display represented by an organic EL display, a liquid crystal display, an electronic paper, and the like, a glass substrate has been mainly used so far. It is necessary to use a flexible substrate. Conventionally, a resin film is generally used as such a flexible substrate (for example, Patent Documents 1 and 2). However, when a resin film is used instead of the glass substrate, there are the following problems.
First, since the resin film is inferior in dimensional stability as compared with the glass substrate, there is a problem that the total pitch is shifted when a display or the like is produced.
Secondly, since the resin film is inferior in gas barrier properties as compared with the glass substrate, there is a problem that the durability of the produced display is inferior. Such a problem was remarkable especially when producing an organic EL display.
Thirdly, in order to improve the barrier property of the resin film, for example, the problem that the transmittance decreases when the SiON film is formed, and the SiON film, the overcoat layer, and the SiON film are formed on the resin film. When the layers are stacked in this order, there is a problem that optical interference occurs when the film thickness is several times the wavelength of light (100 nm to 200 nm), leading to a decrease in transmittance.

JP-A-8-62591 JP 2003-89165 A

  The present invention has been made in view of the above problems, and despite having flexibility, is excellent in gas barrier properties, good in dimensional stability, excellent in strength, and further manufactured at low cost. It is a main object to provide an optical device capable of satisfying the requirements.

  In order to solve the above-mentioned problems, the present invention provides a flexible first glass substrate, a first laminate formed on the first glass substrate and having a first reinforcing layer made of a resin material, and flexibility. Sandwiched between the second glass substrate having the second laminated body and the second laminated body formed on the second glass substrate and having the second reinforcing layer made of a resin material, and the first laminated body and the second laminated body. An optical device having an optical element arranged as described above, wherein the first reinforcing layer and the second reinforcing layer have substantially the same thermal expansion coefficient.

According to the present invention, the first laminated body and the second laminated body are made of a glass substrate having flexibility (first glass substrate, second glass substrate) and a reinforcing layer (first reinforcing layer, second glass substrate) made of a resin material. By having a configuration in which (2 reinforcing layers) are laminated, the optical device of the present invention can have flexibility as a whole. Further, by using the glass substrate, the first laminated body and the second laminated body can be made excellent in total pitch (dimensional stability).
In addition, according to the present invention, since the glass substrate (first glass substrate, second glass substrate) is used for the first laminate and the second laminate, the gas barrier property is excellent. It is possible to suppress the deterioration of the optical element due to the intrusion.
Further, since the thermal expansion coefficients of the first reinforcing layer and the second reinforcing layer are substantially the same, the dimensional stability of the first laminated body and the second laminated body can be made comparable. Therefore, an optical device having high dimensional stability as a whole can be obtained.

Furthermore, since the first laminated body and the second laminated body have flexibility, the optical device of the present invention can be manufactured at a low cost by appropriately adopting a Roll to Roll process, for example. .
Therefore, according to the present invention, there is provided an optical device that is excellent in gas barrier properties, has high dimensional stability, has excellent strength, and can be manufactured at low cost despite having flexibility. can do.

  In the present invention, it is preferable that the first reinforcing layer and the second reinforcing layer have the same thickness and are made of the same material. Thereby, since the thermal expansion coefficient of the 1st reinforcement layer and 2nd reinforcement layer which are used for this invention can be made the same, it originates in the difference in the dimensional stability of a 1st laminated body and a 2nd laminated body. This is because it is possible to prevent deterioration in display quality and display a good image in a wide temperature range.

  In the present invention, the first laminated body has a first reinforcing substrate formed on the first laminated body, the second laminated body has a second reinforcing substrate on the second laminated body. Further, it is preferable that the first reinforcing substrate and the second reinforcing substrate have substantially the same thermal expansion coefficient. Thereby, the strength of the first laminated body and the second laminated body can be improved, and as a result, the optical device of the present invention can be prevented from being easily damaged due to having flexibility. In addition, since the first and second reinforcing substrates have substantially the same thermal expansion coefficient, the display quality is prevented from being deteriorated due to the difference in the thermal expansion coefficient, and the first reinforcing substrate and the second reinforcing substrate are excellent in a wide temperature range. This is because an image can be displayed. From such a viewpoint, in the present invention, it is preferable that the first reinforcing substrate and the second reinforcing substrate have the same thickness and are made of the same material.

  Moreover, in this invention, it is preferable that the said 1st laminated body is a color filter which has the structure by which the toning layer was formed between the said 1st glass substrate and the said 1st reinforcement layer. This is because the optical device of the present invention can be used as a display device having flexibility.

  The optical device of the present invention is advantageous in that although it has flexibility, it has excellent gas barrier properties, good dimensional stability, excellent strength, and can be manufactured at low cost.

It is a schematic sectional drawing which shows an example of the optical apparatus of this invention. It is a schematic sectional drawing which shows an example of the 1st laminated body used for this invention. It is a schematic sectional drawing which shows an example in the case of using a 1st laminated body as a color filter in this invention. It is a schematic sectional drawing which shows the other example when using a 1st laminated body as a color filter in this invention. It is a schematic sectional drawing which shows the other example when using a 1st laminated body as a color filter in this invention.

  Hereinafter, the optical apparatus of the present invention will be described in detail.

  As described above, the optical device of the present invention includes a first glass substrate having flexibility, a first laminate formed on the first glass substrate and having a first reinforcing layer made of a resin material, and flexibility. Sandwiched between a second glass substrate having a second laminated body formed on the second glass substrate and having a second reinforcing layer made of a resin material, and the first laminated body and the second laminated body The first reinforcing layer and the second reinforcing layer have substantially the same thermal expansion coefficient. The optical elements are arranged as described above.

  Such an optical apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of the optical apparatus of the present invention. As illustrated in FIG. 1, the optical device 1 of the present invention has a configuration in which an optical element 10 is sandwiched between a first stacked body 20 and a second stacked body 30. Here, in the optical device 1 of the present invention, the first laminated body 20 includes a first glass substrate 21 having flexibility, and a first reinforcing layer 22 formed on the first glass substrate 21 and made of a resin material. It is what has. Further, in the optical device 1 of the present invention, the second laminated body 30 includes a second glass substrate 31 having flexibility, and a second reinforcing layer 32 formed on the second glass substrate 31 and made of a resin material. It is what you have. The optical device 1 according to the present invention is characterized in that the first reinforcing layer 22 and the second reinforcing layer 32 have substantially the same thermal expansion coefficient.

  1 shows an example in which an organic EL element is used as an optical element, the optical device according to the present application is not limited to such an example, and an optical element having an arbitrary function is used. It is something that can be done.

According to the present invention, the first laminated body and the second laminated body are made of a glass substrate having flexibility (first glass substrate, second glass substrate) and a reinforcing layer (first reinforcing layer, second glass substrate) made of a resin material. By having a configuration in which (2 reinforcing layers) are laminated, the optical device of the present invention can have flexibility as a whole. Further, by using the glass substrate, the first laminated body and the second laminated body can be made excellent in total pitch (dimensional stability).
In addition, according to the present invention, since the glass substrate (first glass substrate, second glass substrate) is used for the first laminate and the second laminate, the gas barrier property is excellent. It is possible to suppress the deterioration of the optical element due to the intrusion.
Further, since the thermal expansion coefficients of the first reinforcing layer and the second reinforcing layer are substantially the same, the dimensional stability of the first laminated body and the second laminated body can be made comparable. Therefore, an optical device having high dimensional stability as a whole can be obtained.
Furthermore, since the first laminated body and the second laminated body have flexibility, the optical device of the present invention can be manufactured at a low cost by appropriately adopting a Roll to Roll process, for example. .
Therefore, according to the present invention, there is provided an optical device that is excellent in gas barrier properties, has high dimensional stability, has excellent strength, and can be manufactured at low cost despite having flexibility. can do.

The optical device of the present invention has at least a first laminate, an optical element, and a second laminate, and may have any other configuration as necessary.
Hereafter, each structure used for this invention is demonstrated in order.

1. First Laminate First, the first laminate used in the present invention will be described. The 1st laminated body used for this invention has a 1st glass substrate which has flexibility, and the 1st reinforcement layer which is formed on the said 1st glass substrate and consists of resin materials.

(1) 1st glass substrate The 1st glass substrate used for this invention is demonstrated. The first glass substrate used in the present invention has flexibility. In the optical device of the present invention, the first glass substrate used in the first laminate has flexibility, so that it can have flexibility as a whole, has excellent gas barrier properties, and is low. It is also possible to manufacture at a cost.

  The first glass substrate used in the present invention is not particularly limited as long as it has flexibility. Here, “having flexibility” means that the glass substrate has a thickness and rigidity that can be easily bent and deformed by stress and can be restored. And in this invention, it is evaluated that it has flexibility, when a crack and a crack do not arise when a bending test is repeated 10 times at least with a bending radius of 100 mm. However, as the first glass substrate used in the present invention, it is preferable that the first glass substrate has flexibility so as not to cause cracks or cracks even when evaluated similarly at a bending radius of 50 mm, more preferably at a bending radius of 30 mm. . The degree of flexibility can be controlled mainly by adjusting the thickness of the first glass substrate.

  The thickness of the 1st glass substrate used for this invention will not be specifically limited if it is in the range which can provide flexibility to a 1st glass substrate, It determines suitably considering various performances, such as gas barrier property. It is something that can be done. Among them, the thickness of the first glass substrate used in the present invention is preferably in the range of 1 μm to 150 μm, more preferably in the range of 20 μm to 120 μm, and particularly preferably in the range of 50 μm to 100 μm. . This is because if the thickness of the first glass substrate is larger than the above range, the flexibility of the entire optical device may be insufficient depending on the use of the optical device of the present invention. Further, for example, when the optical device of the present invention is used as an organic EL display device, from the position where light from the light emitting layer of the organic EL element is incident on the first glass substrate to the position where light is emitted from the first glass substrate. This is because there is a case where the distance becomes larger and light color mixture tends to occur. On the other hand, if the thickness of the first glass substrate is thinner than the above range, the gas barrier property of the first glass substrate may be insufficient. Moreover, if the thickness of the first glass substrate is thin, it will crack or break due to insufficient strength.

  The thickness of the first glass substrate used in the present invention is preferably within the range of 0 to 50 μm, and preferably the same as the thickness of the second glass substrate. . Thereby, the thermal expansion coefficients of the first glass substrate and the second glass substrate can be made substantially the same, and the optical device of the present invention can be further reduced in the total pitch.

The gas barrier property of the first glass substrate used in the present invention can be appropriately determined according to the use of the optical device of the present invention, the type of optical element used in the optical device of the present invention, and the like. It is not particularly limited. Among them, the gas barrier property of the first glass substrate used in the present invention is preferably an oxygen transmission rate (OTR) of 1 × 10 ⁻³ cc / m ² / day / atm or less, preferably 1 × 10 ⁻⁴ cc / m. More preferably, it is ² / day / atm or less.
The water vapor transmission rate (WVTR) is preferably 1 × 10 ⁻⁵ g / m ² / day or less, more preferably 1 × 10 ⁻⁶ g / m ² / day or less. This is because if the water vapor transmission rate is higher than this, the optical element may be deteriorated by water vapor, oxygen, or the like. This is because, in particular, when an organic EL element is used as an optical element, there is a possibility that light emission characteristics are lost and problems such as generation of dark spots occur.
Here, the oxygen transmission rate and the water vapor transmission rate are as follows. The oxygen transmission rate is an MOX OX-TRAN device, and the water vapor transmission rate is MOCON's PERMATRAN-W device in an environment of 23 ° C. and 90% RH. Can be measured in an environment of 40 ° C. and 90% RH.

The first glass substrate used in the present invention is preferably alkali-free glass used for display. Specifically, the glass of each glass manufacturing company such as OA10 (Nippon Electric Glass Co., Ltd.), AN100 (Asahi Glass Co., Ltd.), NA35 (NH Techno Glass Co., Ltd.), EAGLE (Corning Co., Ltd.), and 1737 material (Corning Co., Ltd.) is appropriately thickened. It is desirable to adjust and use. Other materials such as soda lime, low refractive glass, and high refractive glass may be used. Basically, any glass having excellent gas barrier properties can be laminated.
In addition, as a method of adjusting the thickness of the glass, for example, a method of reducing the thickness by polishing a glass substrate having an arbitrary thickness by a mechanical polishing method using a machine or a chemical polishing method such as etching is exemplified. be able to. According to such a method, in addition to being able to arbitrarily adjust the thickness of the glass substrate, there is an advantage that the surface roughness (Ra) of the polished glass substrate can be reduced.

(2) 1st reinforcement layer Next, the 1st reinforcement layer used for a 1st laminated body is demonstrated. The 1st reinforcement layer used for this invention consists of resin materials, and prevents the damage of the said 1st glass substrate by being formed on the said 1st glass substrate. The first reinforcing layer used in the present invention is substantially the same in thermal expansion coefficient as a second reinforcing layer described later.

  In the present invention, the fact that the thermal expansion coefficient is substantially the same means that the difference in thermal expansion coefficient between the first reinforcing layer and the second reinforcing layer is ± 10% or less. However, as will be described later, the first reinforcing layer has the same thickness as the second reinforcing layer and is preferably made of the same resin material.

  As a 1st reinforcement layer used for this invention, a thermal expansion coefficient is substantially the same as the 2nd reinforcement layer mentioned later, and if it can reinforce the said 1st glass substrate to a desired grade, it will be specifically limited. It is not a thing. In particular, it is desirable that the first reinforcing layer used in the present invention has a thermal expansion coefficient closer to that of the first glass substrate. When the thermal expansion coefficient of the first reinforcing layer is closer to the thermal expansion coefficient of the first glass substrate, the first laminate is warped due to the difference in thermal expansion coefficient between the first reinforcing layer and the first glass substrate, It is because it can prevent bending. From such a viewpoint, it is preferable that the thermal expansion coefficient of the first reinforcing layer is within twice the thermal expansion coefficient of the first glass substrate. More specifically, the thermal expansion coefficient of the first reinforcing layer is preferably in the range of 0.9 ppm / ° C to 3.0 ppm / ° C, and in the range of 0.9 ppm / ° C to 2.5 ppm / ° C. More preferably, it is more preferably in the range of 0.9 ppm / ° C. to 2.0 ppm / ° C.

  Here, the thermal expansion coefficient of the first reinforcing layer is measured with a thermomechanical analyzer Thermo Plus TMA8310 (manufactured by Rigaku Corporation) at a heating rate of 10 ° C./min and a tensile load of about 1 to 10 g. be able to.

  Examples of the resin material used for the first reinforcing layer include polyvinyl alcohol, partially formalized polyvinyl alcohol, polyvinyl alcohol resin including partially saponified polymer of ethylene / vinyl acetate copolymer, polyolefin resin, acrylic resin, and PET. Examples thereof include polyester resins such as (polyethylene terephthalate) and PEN (polyethylene naphthalate), polyamide resins, polyamideimide resins, polyimide resins, polycarbonate resins, and polysulfone resins. In the present invention, any of these resin materials can be preferably used, and among these, it is particularly preferable to use PET or PEN. This is because PET and PEN have a relatively small thermal expansion coefficient compared to other resins, and are close to the thermal expansion coefficient of the first glass substrate.

  In addition, the resin material used for a 1st reinforcement layer may be only 1 type, or 2 or more types may be sufficient as it. Moreover, it is preferable that the resin material used for a 1st reinforcement layer is the same as the resin material used for the 2nd reinforcement layer mentioned later.

  The thickness of the first reinforcing layer is not particularly limited as long as it does not impair the flexibility of the first glass substrate. Among these, the thickness of the first reinforcing layer used in the present invention is preferably in the range of 10 μm to 500 μm, more preferably in the range of 50 μm to 250 μm, and further preferably in the range of 75 μm to 150 μm. preferable. This is because if the thickness is thinner than the above range, the reinforcing effect of the first glass substrate by the first reinforcing layer may be insufficient. Moreover, it is because barrier property may become inadequate when thickness is thin. On the other hand, if the thickness is thicker than the above range, the flexibility of the first laminate may be impaired.

  In addition, when the same resin material as the 2nd reinforcement layer mentioned later is used as a resin material used for a 1st reinforcement layer, the thickness of the 1st reinforcement layer in this invention is the same as the thickness of a 2nd reinforcement layer. It is preferable. This is because the thermal expansion coefficients of the first reinforcing layer and the second reinforcing layer can be made the same, and the optical device of the present invention can have high dimensional stability.

(3) Arbitrary Configuration The first laminate used in the present invention has at least the first glass substrate and the first reinforcing layer, but may have other arbitrary configurations as necessary. It ’s good. As an arbitrary structure used for the first laminate, a structure having a desired function can be used as appropriate according to the use and usage of the optical device of the present invention, and is not particularly limited. . As such an arbitrary configuration, for example, a first reinforcing substrate disposed on the first reinforcing layer can be cited. By using such a 1st reinforcement board | substrate, the 1st laminated body used for this invention can be further reinforced, and it can prevent more effectively that it breaks in the manufacturing process etc. of an optical apparatus.

  FIG. 2 is a schematic cross-sectional view showing an example of the case where the first laminate used in the present invention has the first reinforcing substrate. As illustrated in FIG. 2, the first laminate 20 used in the present invention may have a first reinforcing substrate 23 formed on a first reinforcing layer 22.

  The first reinforcing substrate is not particularly limited as long as it can reinforce the first laminate used in the present invention, and may be arbitrarily selected according to the use of the optical device of the present invention. A substrate made of a material can be selected and used. As a material which comprises the 1st reinforcement board | substrate used for this invention, the board | substrate which consists of a board | substrate consisting of inorganic materials, such as glass, a resin material etc. can be mentioned, for example. In the present invention, any of these substrates can be suitably used as the first reinforcing substrate, but among them, a substrate made of a resin material is preferably used. This is because the substrate made of a resin material is excellent in flexibility and can be reinforced without impairing the flexibility of the first laminate.

  Examples of the resin material used as the first reinforcing substrate include PET and PEN.

  The thickness of the first reinforcing substrate used in the present invention is particularly within the range where the flexibility of the first reinforcing substrate used in the present invention is within a range that does not impair the flexibility of the first laminate. It is not limited, and can be determined as appropriate according to the material constituting the first reinforcing substrate. Among them, the thickness of the first reinforcing substrate used in the present invention is preferably in the range of 10 μm to 500 μm, more preferably in the range of 50 μm to 250 μm, and still more preferably in the range of 75 μm to 150 μm. . This is because if the thickness is larger than the above range, the flexibility of the first laminate may be insufficient. Moreover, the problem that the cost will become high when the thickness is thick may arise. On the other hand, if the thickness is less than the above range, the reinforcing effect by using the first reinforcing substrate may be insufficient. Moreover, it is because there exists a possibility that a 1st laminated body may warp easily because strength is insufficient when thickness is thin.

  In addition, when a 2nd reinforcement board | substrate is used for the 2nd laminated body mentioned later, it is preferable that a 1st reinforcement board | substrate has a thermal expansion coefficient substantially the same as a 2nd reinforcement board | substrate. Here, the fact that the thermal expansion coefficients are substantially the same means that the difference in thermal expansion coefficient between the first reinforcing substrate and the second reinforcing substrate is ± 15% or less. But when a 2nd reinforcement board | substrate is used for the 2nd laminated body mentioned later, the 1st reinforcement board | substrate used for this invention is the same thing as a 2nd reinforcement board | substrate, and consists of the same material. Is preferred. Thereby, since the dimensional stability of the first stacked body and the second stacked body can be made comparable, an optical device having higher dimensional stability as a whole can be obtained.

(4) 1st laminated body The 1st laminated body used for this invention has a 1st glass substrate and a 1st reinforcement layer as mentioned above, and is arbitrary according to the use of the optical apparatus of this invention. By adopting the configuration, it can be used as a member having a desired function. Here, the usage mode of the first laminate used in the present invention can be appropriately determined according to the use of the optical device of the present invention. As an example, the optical device of the present invention is used as a display device. When using, the aspect which uses a 1st laminated body as a color filter can be mentioned. More specifically, when the liquid crystal element, the organic EL element, the electronic paper element, or the like is used as the optical element, and the optical device of the present application is used as a display device, the first glass substrate and the first reinforcing layer are used. By forming a toning layer between the first laminate and the second laminate, the first laminate in the present invention can be used as a color filter.

  FIG. 3 is a schematic cross-sectional view showing an example of how the first laminate is used in the present invention. As illustrated in FIG. 3, the first laminate 20 according to the present invention forms the toning layer 24 (24 R, 24 G, 24 B) between the first glass substrate 21 and the first reinforcing layer 22. It can be used as a color filter.

Thus, when using the 1st laminated body in this invention as a color filter, as said toning layer, a desired color can be displayed according to the function of the optical element used for this invention. There is no particular limitation. As an aspect of such a toning layer, an aspect in which the toning layer is a colored layer (first aspect), an aspect in which the toning layer is composed of a colored layer and a color conversion layer formed on the colored layer ( 2nd aspect) and the aspect (3rd aspect) whose toning layer is a color conversion layer are mentioned.
Each aspect will be described below.

(First aspect)
In the present embodiment, the toning layer refers to a colored layer. As illustrated in FIG. 3, in the first laminate 20 of this aspect, the toning layer includes the colored layer 24 (in FIG. 3, the red colored layer 24 </ b> R, the green colored layer 24 </ b> G, and the blue colored layer 24 </ b> B). Is. In this embodiment, a light shielding portion 24 may be formed between the colored layers 25 as shown in FIG.

  The colored layers of each color are regularly arranged corresponding to the pixels. The arrangement of the colored layers is not particularly limited as long as the colored layers of the respective colors are arranged on an average when viewed macroscopically, and examples thereof include a stripe arrangement, a mosaic arrangement, and a delta arrangement.

The colored layer is obtained by dispersing or dissolving a colorant such as a pigment or dye of each color in a binder resin.
Examples of the colorant used in the red coloring layer include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, anthracene pigments, and isoindoline pigments. These pigments may be used alone or in combination of two or more.
Examples of the colorant used in the green coloring layer include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, isoindoline pigments, and isoindolinone pigments. Etc. These pigments or dyes may be used alone or in combination of two or more.
Examples of the colorant used in the blue colored layer include copper phthalocyanine pigments, anthraquinone pigments, indanthrene pigments, indophenol pigments, cyanine pigments, dioxazine pigments and the like. These pigments may be used alone or in combination of two or more.

Moreover, transparent resin is mentioned as binder resin used for a colored layer.
When a printing method is used as a method for forming the colored layer, examples of the binder resin include polymethyl methacrylate resin, polyacrylate resin, polycarbonate resin, polyvinyl alcohol resin, polyvinyl pyrrolidone resin, hydroxyethyl cellulose resin, carboxymethyl cellulose resin, and polyvinyl chloride resin. Melamine resin, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic acid resin, polyamide resin and the like.
In addition, when a photolithography method is used as a method for forming a colored layer, the binder resin is usually an ionizing radiation curing having a reactive vinyl group such as an acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber. Is used. Usually, an electron beam curable resin or an ultraviolet curable resin is used.
When an ultraviolet curable resin is used, a photopolymerization initiator is used alone or in combination with a binder resin. When an ultraviolet curable resin is used, a sensitizer, a coatability improver, a development improver, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant, and the like may be used as necessary.

  As a method for forming a colored layer, for example, a coloring agent is mixed, dispersed or solubilized in a binder resin to prepare a colored layer forming coating solution, and a photolithography method using the colored layer forming coating solution. A method of patterning by a method of patterning by an ink jet method using a coating solution for forming a colored layer is used.

  The thickness of the colored layer used in the present invention can be the same as the thickness of the colored layer used in a general color filter.

(Second aspect)
In this embodiment, the toning layer refers to a layer composed of a colored layer and a color conversion layer formed on the colored layer.

  FIG. 4 is a schematic cross-sectional view showing an example of the first laminate of this aspect. As shown in FIG. 4, in the first laminate 20 of this embodiment, the toning layer has a colored layer 24 (in FIG. 4, a red colored layer 24R, a green colored layer 24G, and a blue colored layer 24B) and each color. A color conversion layer 24 ′ formed on the colored layer 24 (in FIG. 4, a red color conversion layer 24′R, a green color conversion layer 24′G, and a blue color conversion layer 24′B). is there. In this embodiment, a light shielding portion 25 may be formed between the colored layers 24 as shown in FIG.

  According to this aspect, since the toning layer is composed of the colored layer and the color conversion layer formed on the colored layer, the hue of light from the light emitting layer of the optical device can be corrected. It can be set as the 1st laminated body excellent in the balance of a primary color.

(I) Colored layer The colored layer used in this embodiment is the same as that described above, and thus description thereof is omitted here.

(Ii) Color Conversion Layer The color conversion layer used in the present embodiment is provided corresponding to the colored layer, and usually three types of color conversion, a red color conversion layer, a green color conversion layer, and a blue color conversion layer. It has a layer. In this aspect, all of the three types of color conversion layers may be formed on the colored layer, and one or two of the three types of color conversion layers are formed on the colored layer. Also good.

  Moreover, the structure of the color conversion layer used for this aspect changes with structures of the light emitting layer of the organic EL element to which the 1st laminated body of this invention is applied.

  The material used for the color conversion layer is a material in which a color conversion phosphor that absorbs incident light and emits fluorescence of each color is dispersed or dissolved in a resin, and all three colors are ordinary color filters for organic EL display devices. Since the material is the same as that of the color conversion layer used in the above, description thereof is omitted here.

In the color conversion layer, a transmission layer may be formed when the color conversion layer is not formed.
When the transmissive layer is formed, the transmissive layer transmits red light when formed on the red colored layer, and transmits green light when formed on the green colored layer. If it is formed on a blue colored layer, it is not particularly limited as long as it transmits blue light. For example, it does not include a color conversion phosphor and is made of a commonly used resin. be able to.

  The thickness of the color conversion layer is preferably about 0.5 μm to 30 μm, more preferably 5 μm to 20 μm, and still more preferably 8 μm to 15 μm. This is because if the thickness of the color conversion layer is too thick, the level difference (unevenness) due to the configuration of the color conversion layer increases, and it becomes difficult to flatten the surface. Conversely, if the thickness of the color conversion layer is too thin, the color conversion efficiency may be reduced. Further, if the content of the organic phosphor in the color conversion layer is increased in order to reduce the thickness of the color conversion layer, concentration quenching may occur.

  As a method for forming the color conversion layer, for example, each color conversion phosphor and resin are mixed with a solvent, a diluent or an appropriate additive as necessary to prepare a coating liquid for forming each color conversion layer. A method of patterning by a photolithography method using a conversion layer forming coating solution, or a method of patterning by a printing method using each of the above color conversion layer forming coating solutions is used.

  In this embodiment, the order in which the colored layer and the color conversion layer are laminated on the glass substrate may be the order of the colored layer and the color conversion layer, or the reverse order.

(Third aspect)
In the present embodiment, the toning layer refers to a color conversion layer.

  FIG. 5 is a schematic cross-sectional view showing an example of the first laminate of this aspect. In the first laminate 20 of the present embodiment, the toning layer has a color conversion layer 24 ′ (in FIG. 5, a red color conversion layer 24′R, a green color conversion layer 24′G, and a blue color conversion layer 24′B). ). As illustrated in FIG. 5, in this aspect, the light shielding portion 25 may be provided between the color conversion layers 24 ′.

  The color conversion layer used in the present embodiment is not particularly limited depending on the type of light emitting light source of the light emitting layer, and is not particularly limited as long as the color conversion layer can perform a desired hue correction. The color conversion layer is preferably a color conversion layer having a red color conversion layer that changes blue light into red and a green color conversion layer that converts blue light into green. This is because the light incident on the color conversion layer generally contains a blue light component or often contains blue light and green light components. Since the light from the light emitting layer is blue light, it is not necessary to form a blue color conversion layer, but in order to flatten the color conversion layer, the transmission has a thickness equivalent to that of the red color conversion layer and the green color conversion layer. A layer may be formed.

  Since the red color conversion layer, the green color conversion layer, and the transmission layer can be the same as those described above, description thereof is omitted here.

(Other)
In the present invention, the toning layer is preferably a colored layer. This is because by adjusting the pigment contained in the colored layer, it is possible to adjust the color development of the color filter composed of the first laminate to a favorable one.

2. Second Laminate Next, the second laminate used in the present invention will be described. As described above, the second laminate used in the present invention has a flexible second glass substrate and a second reinforcing layer formed on the second glass substrate and made of a resin material. .
The optical device of the present invention can be flexible as a whole because the second glass substrate of the second laminate used in the present invention has flexibility, and has flexibility. Therefore, it is excellent in gas barrier properties and can be manufactured at a low cost by a Roll to Roll process or the like.

  About the 2nd glass substrate used for the said 2nd laminated body, since it is the same as that of what is used for the said 1st laminated body, detailed description here is abbreviate | omitted.

  The second reinforcing layer is not particularly limited as long as it is made of a resin material having substantially the same thermal expansion coefficient as that of the first reinforcing layer. Since the resin material used for the second reinforcing layer can be substantially the same as the first reinforcing layer, detailed description thereof is omitted here. Furthermore, the second reinforcing layer used in the present invention desirably has a thermal expansion coefficient closer to that of the second glass substrate. When the thermal expansion coefficient of the second reinforcing layer is closer to the thermal expansion coefficient of the second glass substrate, the second laminate is warped due to the difference in thermal expansion coefficient between the second reinforcing layer and the second glass substrate, It is because it can prevent bending. From such a viewpoint, it is preferable that the thermal expansion coefficient of the second reinforcing layer is within twice the thermal expansion coefficient of the second glass substrate. More specifically, the thermal expansion coefficient of the second reinforcing layer is preferably in the range of 0.9 ppm / ° C to 3.0 ppm / ° C, and in the range of 0.9 ppm / ° C to 2.5 ppm / ° C. More preferably, it is more preferably in the range of 0.9 ppm / ° C. to 2.0 ppm / ° C.

  In addition, it is preferable that the 2nd glass substrate used for the said 2nd laminated body and a 2nd reinforcement layer consist of the same material as what is used for the said 1st laminated body, and consist of the same thickness. Thereby, the thermal expansion coefficients of the first laminated body and the second laminated body can be made to substantially coincide with each other, so that the optical device of the present invention is less likely to cause deterioration in display quality due to dimensional change. Because you can.

The second laminate used in the present invention may have any configuration other than the second glass substrate and the second reinforcing layer. As an arbitrary configuration used in the present invention, a configuration having a desired function can be appropriately used according to the use and usage of the optical apparatus of the present invention, and is not particularly limited. As such an arbitrary configuration, a second reinforcing substrate disposed on the second reinforcing layer can be exemplified. By using such a second reinforcing substrate, it is possible to reinforce the second laminate used in the present invention and more effectively prevent breakage in the optical device manufacturing process and the like.
Here, since the same thing as the 1st reinforcement board | substrate mentioned above can be used as said 2nd reinforcement board | substrate, detailed description here is abbreviate | omitted.

  In addition, when a 1st reinforcement board | substrate is used for the 1st laminated body mentioned above, it is preferable that a 2nd reinforcement board | substrate has a thermal expansion coefficient substantially the same as a 1st reinforcement board | substrate. Here, the meaning of “the thermal expansion coefficients are substantially the same” is as described above. Furthermore, when a 1st reinforcement board | substrate is used for the 1st laminated body mentioned above, the 2nd reinforcement board | substrate used for this invention has the same thickness as a 1st reinforcement board | substrate, and consists of the same material. Is preferred. Thereby, since the dimensional stability of the first stacked body and the second stacked body can be made comparable, an optical device having higher dimensional stability as a whole can be obtained.

3. Optical Element Next, the optical element used in the present invention will be described. The optical element used in the present invention is appropriately selected according to the use of the optical device of the present invention. Here, the optical element in the present invention has an optical function, and examples of the optical function include a light emitting function and an image display function. When the optical element having a light emitting function is used, the optical device of the present invention can be used as a light emitting device (illuminating device). When the optical element having an image display function is used, the present invention is used. These optical devices can be used as a display device.

  Examples of the optical element having the image display function include a liquid crystal cell used in a liquid crystal display device, an organic EL element used in an organic EL display device, and an electronic paper element used in an electronic paper device (particle movement type, liquid crystal Type, electrochemical type, etc.). Here, by using a liquid crystal cell as the optical element, the optical device of the present invention becomes a liquid crystal display device, by using an organic EL element, an organic EL display device, and further by using an electronic paper element, Become.

The liquid crystal cell, the organic EL element, and the electronic paper element are not particularly limited, and generally known elements can be used.
In the present invention, any of these elements can be suitably used, but the first glass substrate and the second glass substrate are used for the first laminate and the second laminate, respectively. Thus, the first laminate and the second laminate are excellent in gas barrier properties. For this reason, in the present invention, an organic EL element is particularly preferably used. In addition, when an organic EL element is used as an optical element and the optical device of the present invention is an organic EL display device, the organic EL display device may be a passive matrix (PM) type, or more active. It may be a matrix (AM) type.

4). Optical Device As described above, the optical device of the present invention has a configuration in which the optical element is sandwiched between the first stacked body and the second stacked body. In the present invention, the optical element is the first stacked body. As an aspect clamped between a body and a 2nd laminated body, it determines suitably according to the kind etc. of the optical element used for this invention, and it does not specifically limit. Therefore, in the present invention, the first laminated body and the second laminated body may be an embodiment in which the optical element is sandwiched so that the first glass substrate and the second glass substrate are disposed on the optical element side, respectively. Alternatively, the optical element may be sandwiched so that the first glass substrate and the second glass substrate are disposed outside. For example, when the organic EL element is used as the optical element and the optical device of the present invention is used as the organic EL display device, the former mode is preferable. This is because according to such an aspect, it is possible to prevent the organic EL element from being deteriorated due to the influence of degas or the like.

5). Manufacturing Method of Optical Device The optical device of the present invention can be appropriately manufactured by a method in which an optical element can be sandwiched between the first stacked body and the second stacked body as described above. As such a method, for example, a first laminated body producing step for producing a first laminated body, a second laminated body producing step for producing a second laminated body, and the first laminated body and the second laminated body, And a method using a sealing step in which the optical element is sandwiched between the first laminated body and the second laminated body. In addition, a method in which an optical element is directly formed on one of the first stacked body and the second stacked body and then the other stacked body is disposed on the optical element can also be used.

  As a method for producing the first laminated body and the second laminated body in the first laminated body producing step and the second laminated body producing step, the first laminated body and the second laminated body having the above-described configuration are produced. The method is not particularly limited as long as it can be performed. As such a method, for example, using a glass substrate of an arbitrary thickness, a reinforcing layer forming step of forming a reinforcing layer made of a resin material on the glass substrate, a glass substrate polishing step of polishing the glass substrate, Can be exemplified. By such a method, a 1st laminated body and a 2nd laminated body can be produced. Moreover, according to such a method, in addition to being able to arbitrarily adjust the thickness of the glass substrate in the glass plate polishing step, there is an advantage that the surface roughness (Ra) of the glass substrate can be made small. is there. According to the above method, for example, the surface roughness (Ra) of the polished glass substrate can be 2 nm or less.

The glass substrate used in the reinforcing layer forming step may have flexibility or may not have flexibility. Although the 1st laminated body produced in a 1st laminated body preparation process will finally have flexibility, even if it is a case where the glass substrate used for this process does not have flexibility, the glass mentioned later Since flexibility is imparted by reducing the thickness of the glass substrate in the substrate polishing step, the presence or absence of flexibility does not matter in this step. Rather, in this step, it is preferable that the glass substrate used in this step does not have flexibility from the viewpoint that the toning layer can be formed with high positional accuracy and thickness accuracy. Therefore, the thickness of the glass substrate before polishing is preferably in the range of 0.1 mm to 2 mm, more preferably in the range of 0.3 mm to 1.1 mm, and 0.4 mm to 0.7 mm. More preferably, it is in the range.
In order to reduce the manufacturing cost of the first laminated body or the second laminated body, it is preferable to use a mass-produced glass substrate. It becomes expensive with other glass substrates. Considering the burden in the glass substrate polishing step, it is preferable to use a glass substrate before polishing that is as thin as possible. However, if it is too thin, there is a risk of causing trouble in transporting the production line.

As a glass substrate used for this invention, the alkali free glass used for a display is desirable. Specifically, the glass of each glass manufacturing company such as OA10 (Nippon Electric Glass), AN100 (Asahi Glass), NA35 (NH Techno Glass), EAGLE (Corning), and 1737 materials (Corning) may be used. desirable.
Other materials such as soda lime, low refractive glass, and high refractive glass may be used. Basically, any glass having excellent gas barrier properties can be laminated.

  Next, the reinforcing layer forming step will be described. The method for forming the reinforcing layer in this step is not particularly limited as long as it can form a reinforcing layer having a predetermined thickness using a desired resin material. For example, a resin material is contained. The reinforcing layer forming composition is applied on the glass substrate (or on the toning layer when the toning layer is formed), and then cured as necessary, or made of a desired resin material. Although the method etc. which affix a resin film on a glass substrate (on a toning layer when the toning layer is formed) can be mentioned, it is not this limitation. In addition, in the case of the method of bonding the resin film which consists of the said desired resin material on a glass substrate, you may interpose an adhesive bond layer between the said resin film and a glass substrate.

  Next, the glass substrate polishing step will be described. In this step, the glass substrate on which the reinforcing layer is formed is polished from the side opposite to the surface on which the reinforcing layer is formed, so that the thickness of the glass substrate is such that the first laminate and the second laminate have flexibility. This is a process for reducing. Here, when the glass plate is polished in this step, since the strength of the glass substrate is improved by forming the reinforcing layer, even if the glass substrate is polished to such a thickness, the glass substrate It is possible to remarkably reduce the occurrence of damage and the like.

The method for polishing the glass substrate in this step is not particularly limited as long as the thickness of the glass substrate can be within the above range. Examples of such a polishing method include a mechanical polishing method using a machine and a chemical polishing method such as etching.
Since the mechanical polishing method is the same as the method of polishing a transparent substrate made of an inorganic material used in general precision equipment, description thereof is omitted here.
The chemical polishing method may be dry etching or wet etching. Usually, wet etching is preferably used. This is because wet etching is advantageous in terms of cost and production efficiency, and since dissolution proceeds by a chemical reaction, it is easy to control the etching rate by selecting an etching agent. It is.

  The thickness of the glass substrate after being polished in this step is not particularly limited as long as it is within a range of 0.01 mm to 0.2 mm, but in particular within a range of 0.01 mm to 0.15 mm. More preferably, it is more preferably in the range of 0.05 mm to 0.1 mm. This is because if the thickness is less than the above range, cracks, pinholes and the like are likely to occur during polishing in the glass substrate polishing step. Moreover, it is because the flexibility of the glass substrate after grinding | polishing may become inadequate when too thick. In addition, since the reinforcing layer is formed on the glass substrate to be polished in this step as described above, even if the glass substrate is polished to the above range, it is polished with high thickness accuracy without causing damage or the like. Is possible.

  Next, the sealing process will be described. In this step, the first laminated body and the second laminated body having flexibility are used and the optical device is sealed so as to be sandwiched between the two laminated bodies. The method for sealing the optical element with the first laminate and the second laminate in this step is not particularly limited as long as the optical element can be reliably sealed. Here, since the first stacked body and the second stacked body have flexibility, this step can be performed by a Roll to Roll process. In this step, a method using a sealant or the like can be arbitrarily used as necessary to seal the optical element.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  Hereinafter, the present invention will be described more specifically by showing examples.

[Example]
A light shielding portion and a colored layer were produced on a glass substrate (150 × 150 mm, thickness 0.7 mm) of OA10 (Nippon Electric Glass Co., Ltd.). Here, a black resist (manufactured by TOK Co.) is applied to the light-shielding portion so as to have a thickness of about 1 μm after pre-baking (80 ° C. × 180 sec), and after pre-baking, mask exposure (exposure amount: about 100 mJ / cm ² ), development (KOH) 1% solution was used for development for about 60 seconds, followed by washing with water (60 seconds), followed by post-baking (at 230 ° C. for 30 minutes). Next, in order to form a colored layer, a colored resist was prepared in the same manner for each color in the order of R, G, and B.
Next, a PET film (thickness: 100 μm) was used as the first reinforcing layer, and this was laminated to the side of the glass substrate on which the colored layer was formed under vacuum using a UV curable adhesive. At this time, the film thickness of the adhesive was about 50 μm. After bonding, UV light was irradiated to cure the UV curable adhesive. Next, the glass substrate on which the first reinforcing layer is bonded in order to provide flexibility is polished from the side opposite to the side on which the colored layer is formed, and the thickness of the glass substrate is reduced from 0.7 mm to 0.00 mm by roughing. The film thickness was reduced to 11 mm. Further, the glass substrate was finished to a thickness of 0.1 mm by finish polishing. The first laminate thus produced has a total thickness of 0.25 mm including the first glass substrate (0.1 mm), the adhesive (0.05 mm), and the first reinforcing layer (0.1 mm). there were. In addition, the surface roughness (Ra) of the 1st glass substrate after final polishing was 2 nm or less. Moreover, the total pitch (dimensional stability) of the produced 1st laminated body achieved 1.5 micrometer / 100mm or less. Here, the total pitch was evaluated by a method in which a cross pattern was formed at the four corners of the glass substrate when the light-shielding portion was formed, and the expansion / contraction relative to the design value was evaluated by measuring the center coordinates of the cross pattern. . As a measuring apparatus, SIMC-800 (manufactured by Sokkia) was used. In the evaluation, the environment of the measurement apparatus was controlled at 23.0 ° C., and the measurement substrate was held on the measurement stage until it reached 23.0 ° C., and then the measurement was performed.

  An ITO film, ITO film patterning, an insulating layer, a partition, an organic EL element (white), and a cathode were sequentially formed on the produced first laminate to produce a PM type organic EL element.

Using a glass substrate (150 × 150 mm, thickness 0.7 mm) of OA10 (Nippon Electric Glass Co., Ltd.), a PET film (thickness 100 μm) as a second reinforcing layer using a UV curable adhesive on the glass substrate. Were pasted together. At this time, the film thickness of the adhesive was about 50 μm.
Next, the glass substrate was polished from the side opposite to the surface on which the second reinforcing layer was formed, and the thickness of the glass substrate was set to 0.1 mm. The second laminate produced in this manner was placed on the organic EL element formed on the first laminate and sealed. Thus, an organic EL display device was produced.

[Comparative example]
Instead of the glass substrate, a barrier film obtained by laminating SiON with a thickness of 100 nm on a PET film was used, and a colored layer and an organic EL element were produced on the barrier film by the same method as in the examples.
Next, using a barrier film obtained by laminating 100 nm of SiON on a PET film, the barrier film was placed on the organic EL element and sealed. Thus, an organic EL display device was produced.

[Evaluation]
As a result of conducting a lighting test on the organic EL display devices manufactured in Examples and Comparative Examples, no deterioration of elements and dark spots due to degas such as moisture were observed in the Examples.
On the other hand, in the comparative example, many black spots (dark spots) that seem to be caused by insufficient barrier properties occurred.

DESCRIPTION OF SYMBOLS 1 ... Optical apparatus 10 ... Optical element 20 ... 1st laminated body 21 ... 1st glass substrate 22 ... 1st reinforcement layer 23 ... 1st reinforcement substrate 24 ... Toning layer 25 ... Light-shielding part 30 ... 2nd laminated body 31 ... 1st 2 glass substrates 32 ... 2nd reinforcement layer

Claims (5)

A first glass substrate having flexibility, and a first laminate formed on the first glass substrate and having a first reinforcing layer made of a resin material;
A second glass substrate having flexibility, and a second laminated body formed on the second glass substrate and having a second reinforcing layer made of a resin material;
An optical device having an optical element disposed so as to be sandwiched between the first stacked body and the second stacked body,
The optical device, wherein the first reinforcing layer and the second reinforcing layer have substantially the same thermal expansion coefficient.   The optical device according to claim 1, wherein the first reinforcing layer and the second reinforcing layer have the same thickness and are made of the same material. The first laminated body is obtained by forming a first reinforcing substrate on the first laminated body,
The second laminate has a second reinforcing substrate formed on the second laminate,
The optical device according to claim 1, wherein the first reinforcing substrate and the second reinforcing substrate have substantially the same thermal expansion coefficient.   The optical device according to any one of claims 1 to 3, wherein the first reinforcing substrate and the second reinforcing substrate have the same thickness and are made of the same material. .   The first laminated body is a color filter having a configuration in which a colored layer is formed between the first glass substrate and the first reinforcing layer. An optical device according to any one of the claims.

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